EP0272556B1 - Flat spring structure for magnetic tape cassettes, in particular video cassettes - Google Patents

Flat spring structure for magnetic tape cassettes, in particular video cassettes Download PDF

Info

Publication number
EP0272556B1
EP0272556B1 EP87118392A EP87118392A EP0272556B1 EP 0272556 B1 EP0272556 B1 EP 0272556B1 EP 87118392 A EP87118392 A EP 87118392A EP 87118392 A EP87118392 A EP 87118392A EP 0272556 B1 EP0272556 B1 EP 0272556B1
Authority
EP
European Patent Office
Prior art keywords
flat spring
lamina
spring structure
cover
zone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87118392A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0272556A3 (en
EP0272556A2 (en
Inventor
Abramo Bordignon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koller Group Inc A Delaware Corp Te Mi
Original Assignee
ATB SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from IT2421986U external-priority patent/IT210553Z2/it
Priority claimed from IT2421886U external-priority patent/IT210573Z2/it
Application filed by ATB SpA filed Critical ATB SpA
Priority to AT87118392T priority Critical patent/ATE81225T1/de
Publication of EP0272556A2 publication Critical patent/EP0272556A2/en
Publication of EP0272556A3 publication Critical patent/EP0272556A3/en
Application granted granted Critical
Publication of EP0272556B1 publication Critical patent/EP0272556B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/04—Magazines; Cassettes for webs or filaments
    • G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
    • G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
    • G11B23/08707—Details
    • G11B23/08728—Reels or cores; positioning of the reels in the cassette

Definitions

  • the present invention relates to a flat spring structure contained in magnetic video tape cassettes.
  • the flat springs are associated at their middle portion with the inner surface of the cover and act, by elastic pressure contact, on said pivots at the free ends of said flat springs.
  • the flat springs are currently manufactured according the most widely varying configurations starting from the elongated rhomboidal configuration to more recent configurations which substantially have an extension with a more reduced width.
  • said flat springs seen edgewise, have a substantially curved or piecewise configuration with the concavity facing towards the supporting reels.
  • Flat springs according to universally adopted standards, must have such a shape as to exert on the reel, at the moment of their use, an elastic thrust at the contact pivot, which can be estimated, for example for the VHS system, at approximately 200 g.
  • the maximum resisting moment is located at the point of contact with the cassette, that is to say in the central region of the elastic lamina, and decreases to 0 at the region of contact with the pivot.
  • EP-A-203,302 is a an opposed pair of masks or liners interposed between the top and bottom parts of the cassette shell and the tape reels.
  • the liners comprise fold lines cooperating with the cover to apply a very small force, whereby flopping portions act as a guide for the edges of the tape as it is wound onto the reels.
  • the opposed masks act on the reel with a variable degree of force. A minimum force is exerted on the empty reel, and a maximum force is exerted on the winds of a full reel of tape.
  • the opposed masks do not act on the axes of the reels, for applying a significant retaining force thereto for effectively retaining the reel axes in position until and during insertion of the axles of the recording apparatus into the hollow hubs of the tape reels.
  • the aim proposed by the invention is indeed to eliminate the above described disadvantages by providing a flat spring structure for video cassettes which radically alters conventional manufacturing criteria, offering the possibility of exerting the required elastic thrust on the pivot, though considerably reducing both the width and the thickness of the lamina which constitutes the spring.
  • the invention provides a flat spring structure which allows inversion of the direction of reaction of the force at the region of connection of the flat spring to the cover of the cassette, with respect to conventional flat springs, since the obtainable component of reaction force is directed towards the interior of the cassette.
  • the invention provides a lamina which, in resting conditions before its assembly in the cassette, has a reduced camber, that is to say a reduced distance from the resting plane of the central portion, contrarily to the solutions of the prior art which, in order to have the required characteristics of elasticity, must have a high camber with the consequent need for elongation of the lamina in order to prevent any jamming during assembly.
  • Still another object of the present invention is to provide a flat spring structure which allows to considerably simplify all the manufacturing steps, while leading to the obtainment of a product with high quality characteristics.
  • the flat spring structure for magnetic tape cassettes in particular video cassettes, according to the invention, comprises an elastic lamina, generally indicated by the reference numeral 1, which has a substantially elongated configuration.
  • the reference numeral 1 Preferably it is constituted by a strip of constant width which is rounded at its longitudinal ends 2.
  • the elastic lamina 1 is preferably provided with a through hole 3 for the coupling of an element 4 for fixing to the cover 5 of the cassette,
  • the lamina is inserted inside the cassette and is connected, as described, to the cover 5 and acts on the pivot 6 of a reel 7 which is rotatably supported, in a per se known manner, inside the container 8 of the video cassette or the like.
  • the elastic lamina 1 has the configuration of a concave piecewise line which is determined by a fold line 10 which is provided in a middle portion comprised between the free end of the spring and the region where the hole 3 for connection to the cover is provided.
  • the distance between the axes of the reel pivots is approximately 92 mm; in order to obtain good results, the flat part delimited by the two fold lines 10 disposed symmetrically with respect to the hole 3 or zone of coupling with the cover, must be between 32 and 60 mm, i.e. in each of the two arms, the fold line 10 must be spaced from the anchorage point or axis of the cover by a distance of 16 to 30 mm. Furthermore, it has been shown that by increasing the flat part, one has the possibility, while maintaining equal elastic characteristics, of reducing the thickness of the lamina.
  • an initial fold line 20 which is advantageously provided proximate to the hole 3 at a distance which is approximately one sixth of the distance between the hole 3 and the end of the lamina in contact with the pivot.
  • the fold line 10 is arranged in contact with the inner surface of the cover, providing in practice a fulcrum point with a reduced lever arm for the elastic oscillation of said lamina.
  • the lamina is arranged itself substantially parallel to the cover 5, thereby exerting a force which is axially aligned with the reel 7.
  • the flat spring structure for magnetic tape cassettes, in particular video cassettes comprises an elastic lamina, generally indicated by the reference numeral 100, which, in a preferred embodiment, has an elongated configuration with a width which is substantially constant along its entire longitudinal extension.
  • Said lamina 100 is insertable inside a video cassette so that its free ends, where rounded portions 102 are provided, act by contact at the pivot 103 provided on the axis of the reel 104.
  • the elastic lamina 100 is provided with a through hole 105 where means for connection to the inner surface of the cover 106 of the video cassette can be coupled.
  • the peculiarity of the invention resides in the fact that, in order to stiffen the lamina so as to obtain the required elastic thrust on the reel, while further reducing the thickness of said lamina, so as to reduce the material used, ridges are provided on the lamina.
  • the ridges 110 extend longitudinally on said lamina starting from the region where the hole 105 is provided and reach proximate to the zone of contact with the pivot 103.
  • said ridges can be provided by stamping operations, so as to modify the surface continuity and linearity of the lamina according to convention criteria, thereby obtaining a considerable stiffening with consequent increase in its characteristics of elasticity.
  • Said ridges can be provided protruding form the face directed towards the reels or towards the opposite face with the criterion of having the greatest ridge in the region where the greatest moment of flexure is exterted.
  • Said ridges extend symmetrically starting from the central zone with a width which preferably decreases towards the ends for acting on the pivots 103, since in known solutions the greatest stresses generally occur at the central portions of the lamina.
  • the presence of the ridges in the zone where the greatest moment of flexure of the lamina occurs is applicable to laminae having any currently adopted configuration.
  • said lamina is provided, in a portion comprised between the zone where the hole 105 is provided and the end in contact with the pivots 103, with at least one fold 120, so that said lamina assumes the configuration of a piecewise line concave on the face directed towards the reels 103.
  • the invention achieves the intended aim and objects, and in particular the fact is stressed that the provision of the flat spring with a piecewise line configuration allows to obtain a better distribution of the forces, with respect to convention springs which generally have a curved shape which causes the discharging of the forces substantially entirely at the central region of coupling of the lamina to the cover.
  • any piecewise-line springs available on the market are merely a constructive simplification of curved springs, since any folding lines provided do not constitute a pivoting point for elastic oscillation.

Landscapes

  • Springs (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
EP87118392A 1986-12-23 1987-12-11 Flat spring structure for magnetic tape cassettes, in particular video cassettes Expired - Lifetime EP0272556B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118392T ATE81225T1 (de) 1986-12-23 1987-12-11 Flache federanordnung fuer magnetbandkassetten, insbesondere videokassetten.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT2421986U 1986-12-23
IT2421986U IT210553Z2 (it) 1986-12-23 1986-12-23 Struttura di molla a lamina per cassetta di nastro magnetico, in particolare videocassette.
IT2421886U IT210573Z2 (it) 1986-12-23 1986-12-23 Struttura di molla a lamina per cassette di nastro magnetico, in particolare videocassette.
IT2421886U 1986-12-23

Publications (3)

Publication Number Publication Date
EP0272556A2 EP0272556A2 (en) 1988-06-29
EP0272556A3 EP0272556A3 (en) 1989-08-23
EP0272556B1 true EP0272556B1 (en) 1992-09-30

Family

ID=26328484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118392A Expired - Lifetime EP0272556B1 (en) 1986-12-23 1987-12-11 Flat spring structure for magnetic tape cassettes, in particular video cassettes

Country Status (14)

Country Link
US (1) US4899243A (it)
EP (1) EP0272556B1 (it)
JP (1) JP2565520B2 (it)
CN (1) CN1010135B (it)
BR (1) BR8706918A (it)
CA (1) CA1300259C (it)
DE (1) DE3782017T2 (it)
ES (1) ES2035024T3 (it)
GR (1) GR3006179T3 (it)
HK (1) HK217396A (it)
MX (1) MX172177B (it)
PT (1) PT86404B (it)
SU (1) SU1655307A3 (it)
YU (1) YU235887A (it)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5263659A (en) * 1987-03-25 1993-11-23 The Koller Group, Inc. Reel spring for magnetic tape cassettes
US4773615A (en) * 1987-03-25 1988-09-27 Carroll William M Magnetic tape cassettes
DE8903934U1 (de) * 1989-03-31 1989-08-24 Basf Ag, 6700 Ludwigshafen Andruckfeder für Bandkassetten und Bandkassetten damit
US5121276A (en) * 1989-04-26 1992-06-09 Minnesota Mining And Manufacturing Company Insertable tape cartridge for videocassette having a reel restraining member
CA2012911A1 (en) * 1989-04-26 1990-10-26 James E. Skavnak Insertable tape cartridge for videocassette
NL190428C (nl) * 1989-08-30 1994-02-16 Gold Star Co Bladveer voor het steunen van de toevoer- en opneemspoelen van een videobandcassette.
KR910007876Y1 (ko) * 1989-09-16 1991-10-07 주식회사 에스 케이 씨 비디오 테이프 카세트의 릴지지용 스프링
US5110228A (en) * 1989-12-20 1992-05-05 Mitsubishi Kasei Corporation Cassette with a loosening prevention mechanism
US5005780A (en) * 1990-01-02 1991-04-09 Koller Manufacturing Corporation Reel spring for magnetic tape cassettes
JP2626129B2 (ja) * 1990-02-21 1997-07-02 松下電器産業株式会社 テープカセット
DE9013321U1 (de) * 1990-03-16 1990-11-22 Seung Kyong Elektronics Co., Ltd., Kyunggi-Do Tragfeder für eine Videobandkassette
US5332172A (en) * 1990-08-06 1994-07-26 Minnesota Mining And Manufacturing Company Tapered reel pressure spring
KR920005944Y1 (ko) * 1990-09-18 1992-08-27 유한전자 주식회사 비디오 테이프의 릴스프링 구조
JP2564572Y2 (ja) * 1991-08-23 1998-03-09 富士写真フイルム株式会社 磁気テープカセット
KR940006340B1 (ko) * 1992-01-10 1994-07-18 한국과학기술원 액정 선편광기
JP2576846Y2 (ja) * 1992-06-04 1998-07-16 ティーディーケイ株式会社 テープカセット
US5484117A (en) * 1994-03-31 1996-01-16 Minnesota Mining And Manufacturing Company Reel spring for a thin-walled videocassette
CN1051163C (zh) * 1994-08-09 2000-04-05 贾森有限公司 盒式磁带的涂层弹簧片
US6910656B2 (en) 2003-02-20 2005-06-28 Eastman Kodak Company Ink ribbon cartridge with leaf spring and method of assembling the same
JP4697334B2 (ja) * 2008-02-06 2011-06-08 パナソニック株式会社 プラズマディスプレイ装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE203302C (it) *

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5671865A (en) * 1979-11-16 1981-06-15 Nishi Nippon Bane Seisakusho:Kk Reel supporting plate spring for video cassette
US4368860A (en) * 1979-12-06 1983-01-18 Hitachi Maxell, Ltd. Magnetic recording tape cassette
JPS6215906Y2 (it) * 1980-07-28 1987-04-22
EP0060497B1 (en) * 1981-03-11 1985-10-02 Hitachi Maxell Ltd. Magnetic recording tape cartridge
JPS58118069A (ja) * 1981-12-29 1983-07-13 Iwata Denko Kk カセツト用リ−ルスプリングの製造方法
JPS5945787U (ja) * 1982-09-17 1984-03-27 ソニー株式会社 テ−プカセツト
JPS5950083U (ja) * 1982-09-22 1984-04-03 松下電器産業株式会社 テ−プカセツト
DE8335295U1 (de) * 1983-12-09 1984-05-03 Basf Ag, 6700 Ludwigshafen Andruckfeder fuer bandkassetten
DE8335294U1 (de) * 1983-12-09 1984-03-22 Basf Ag, 6700 Ludwigshafen Andruckfeder für Bandkassetten und Bandkassetten damit
JPH0750547B2 (ja) * 1984-02-10 1995-05-31 松下電器産業株式会社 テープカセツト
DE8418178U1 (de) * 1984-06-15 1985-01-03 Basf Ag, 6700 Ludwigshafen Bandkassette, insbesondere video-magnetbandkassette mit mindestens einer andruckfeder
DE8418179U1 (de) * 1984-06-15 1985-01-31 Basf Ag, 6700 Ludwigshafen Bandkassette mit andruckfeder
JPS6145781U (ja) * 1984-08-29 1986-03-26 日本発条株式会社 Ｖｔｒカセツトのリ−ル押え用ばね板
US4662579A (en) * 1985-08-16 1987-05-05 Shape Inc. Coined reel leaf spring for a video tape cassette
US4770367A (en) * 1987-03-25 1988-09-13 Carroll William M Magnetic tape cassettes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE203302C (it) *

Also Published As

Publication number Publication date
BR8706918A (pt) 1988-07-26
US4899243A (en) 1990-02-06
EP0272556A3 (en) 1989-08-23
EP0272556A2 (en) 1988-06-29
SU1655307A3 (ru) 1991-06-07
CN87101218A (zh) 1988-07-06
JP2565520B2 (ja) 1996-12-18
MX172177B (es) 1993-12-07
US4899243B1 (it) 1992-10-13
DE3782017T2 (de) 1993-02-18
GR3006179T3 (it) 1993-06-21
CA1300259C (en) 1992-05-05
CN1010135B (zh) 1990-10-24
DE3782017D1 (en) 1992-11-05
JPH0287382A (ja) 1990-03-28
YU235887A (en) 1989-10-31
HK217396A (en) 1996-12-27
ES2035024T3 (es) 1993-04-16
PT86404B (pt) 1993-08-31
PT86404A (pt) 1989-01-17

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